Re: [PATCH 0/2] squashfs: support linear addressing

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On Wed, 16 May 2012 15:09:23 +0900, "Vyacheslav Dubeyko" <slava@xxxxxxxxxxx> wrote:
> By the way, what about reliability of your solution? I mean possible
> bit-flips, bad blocks in the case of "pure" NAND. Maybe, I am not fully
> familiarize with your solution but I worry about reliability issues.
> And what about MTD layer API? Why do you not use MTD layer in your
> solution?

To mount squashfs images in raw NAND flashes, as you suggested, we
should use UBI, etc. to handle bad block management.
BTW, I guess raw NAND flashes are not linearly accessible.

What we are assuming is devices which can be directly accessed by
physical addresses, such as RAM, NOR flashes, etc.

Best regards,
  UCHINO Satoshi

> On Tue, 2012-05-15 at 20:33 +0900, UCHINO Satoshi wrote:
>> This patchset enables the SquashFS driver to load data directly from a
>> linear adressed memory range (usually non volatile memory like flash)
>> instead of going through the block device layer.  This saves some
>> memory since no intermediate buffering is necessary.
>> The location of the SquashFs image need to be specified by using the
>> physaddr=0x******** mount option.
>> For example,
>>   mount -t squashfs_linear -o physaddr=0x100000 none /mnt
>> In addition, the linear SquashFS image can be used as a root file
>> system.  To actually have the kernel mount this SquashFS image as a
>> root file system, you must also pass the command line parameter
>> "root=/dev/null", "rootfstype=squashfs_linear", and
>> "rootflags=physaddr=0x********" to the kernel (replace 0x******** with
>> the physical address location of the linear SquashFs image to boot
>> with).
>> UCHINO Satoshi (2):
>>   squashfs: add an extra argument to decompress callback
>>   squashfs: support linear addressing
>>  fs/squashfs/Kconfig          |   25 +++++++
>>  fs/squashfs/block.c          |   72 ++++++++++++++++++---
>>  fs/squashfs/decompressor.h   |    6 +-
>>  fs/squashfs/inode.c          |   10 +++
>>  fs/squashfs/lzo_wrapper.c    |   12 +++-
>>  fs/squashfs/squashfs.h       |    5 ++
>>  fs/squashfs/squashfs_fs_sb.h |    2 +
>>  fs/squashfs/super.c          |  144 
>> +++++++++++++++++++++++++++++++++++++++---
>>  fs/squashfs/xz_wrapper.c     |    7 ++-
>>  fs/squashfs/zlib_wrapper.c   |    7 ++-
>>  10 files changed, 265 insertions(+), 25 deletions(-)
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